Flexi Says: Bacteria were at first classified based solely on their shape (vibrio, bacillus, coccus etc.), presence of endospores, gram stain, aerobic conditions and motility. This system changed with the study of metabolic phenotypes, where metabolic characteristics were used.[76] Recently, with the advent of molecular phylogeny, several genes are used to identify species, the most important of which is the 16S rRNA gene, followed by 23S, ITS region, gyrB and others to confirm a better resolution. This bacterial nomenclature system is known as the Bacteriological Code. A bacterium has a binomial name that consists of two parts: the genus name, which indicates which genus it belongs to and the species epithet. For example, Moraxella bovis
